Explorer 1 vs. Sputnik 1 & Gagarin

Yuri Gagarin: 50th Anniversary of First Human Spaceflight - 12th April 2011 - "First Orbit" Trailer

Yuri Alekseyevich Gagarin (9 March 1934 – 27 March 1968)
was a Soviet pilot and cosmonaut. He was the first human to journey into outer space when his Vostok spacecraft completed an orbit of the Earth on April 12, 1961)



Source: GOOGLE

***** 2011 April 12: Astronomy Picture of the Day "On April 12th, 1961, Soviet cosmonaut Yuri Alexseyevich Gagarin became the first human in space." ... First Orbit - the movie ...



1. First Soviet's Sputnik (1957) - On Oct. 4, 1957, Sputnik 1 successfully launched and entered Earth's orbit.

2. Explorer 1 - First U.S. Satellite (1958) - On Jan. 31, 1958, the JPL-designed and -built Explorer 1 soared into space. The spacecraft, a quick response to the Soviet's Sputnik, l ofted the United States into the Space Age.

3. On 12 April 1961, aboard the Vostok 3KA-3 (Vostok 1), Gagarin became both the first human to travel into space, and the first to orbit the earth. His call sign was Kedr

4. At 9:34 a.m. Eastern Time on May 5, 1961. The flight of Freedom 7 - the first space flight by an American - followed less than a month after the first human venture into space by Soviet Cosmonaut Yuri Gagarin.
- http://apod.nasa.gov/apod/ap110505.html

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